Water hardness in Mitry-Mory
36.9 °fH very hard
Tap water in Mitry-Mory is very hard: 36.9 °fH (369 mg/L · 21.6 gpg · 20.7 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 77294 (2026-08) · data checked 2026-10-19
Range across supply zones: 280–414 mg/L.
Mitry-Mory in Seine-et-Marne is served by several operators (RCEEM, Suez and Veolia), so the exact water source varies by neighbourhood. The median of 369 mg/L CaCO₃ sits within a range of 280 to 414 mg/L, high values linked to Paris Basin limestone and gypsum. Check the figure for your own address before sizing a softener.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 36.9 °fH |
|---|---|
| Utility | Rceem; Suez Eau France Oise Nord Idf; Veolia Eau - Territoire Marne & Oise |
How Mitry-Mory compares
- Tap water in Mitry-Mory is 54 % harder than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 1769 of 33641 in France (1 = hardest); 95 % of these cities have softer water.
- In Seine-et-Marne it is number 59 of 500 cities; the regional median is 27.7 °fH.
- Nearest city with clearly softer water: Compans, 4 km away (26.3 °fH).
- Nearest city with clearly harder water: Gressy, 5 km away (56.2 °fH).
Ranking of the hardest and softest water in France →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Mitry-Mory
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 21 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| Hoover | S3 |
| LG | H3 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Mitry-Mory water hard or soft?
It is very hard: 369 mg/L as CaCO₃ (21.6 gpg, 20.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Mitry-Mory safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
How many grains per gallon is Mitry-Mory water?
21.6 gpg, equal to 20.7 °dH, 36.9 °fH or 369 mg/L calcium carbonate.
What dishwasher salt setting should I use in Mitry-Mory?
For 369 mg/L (20.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Mitry-Mory?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 77294 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 77294 · Outdated figure? Tell us